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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Reference
Endpoint:
bioaccumulation in aquatic species: fish
Type of information:
(Q)SAR
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
QSAR prediction: (Q)SAR method with established scientific validity
Qualifier:
no guideline followed
Principles of method if other than guideline:
BCFBAF v3.01 in EPI Suite (v4.1)
GLP compliance:
no
Remarks:
not applicable
Radiolabelling:
no
Vehicle:
no
Test organisms (species):
other: QSAR model
Route of exposure:
other: QSAR model
Test type:
other: QSAR model
Water / sediment media type:
not specified
Remarks:
freshwater
Hardness:
QSAR model
Test temperature:
QSAR model
pH:
QSAR model
Dissolved oxygen:
QSAR model
TOC:
QSAR model
Salinity:
QSAR model
Nominal and measured concentrations:
QSAR model
Reference substance (positive control):
not required
Type:
BCF
Value:
3.162 L/kg
Basis:
whole body w.w.
Remarks on result:
other: regression based method
Type:
BAF
Value:
0.894 L/kg
Basis:
whole body w.w.
Remarks on result:
other: Arnot-Gobas (upper trophic)
Details on results:
--------------------------------- BCFBAF v3.01 --------------------------------
Summary Results:
Log BCF (regression-based estimate): 0.50 (BCF = 3.16 L/kg wet-wt)
Biotransformation Half-Life (days) : 0.00627 (normalized to 10 g fish)
Log BAF (Arnot-Gobas upper trophic): -0.05 (BAF = 0.894 L/kg wet-wt)

Log Kow (experimental): -1.38
Log Kow used by BCF estimates: -1.38

Equation Used to Make BCF estimate:
Log BCF = 0.50

Correction(s): Value
Correction Factors Not Used for Log Kow < 1

Estimated Log BCF = 0.500 (BCF = 3.162 L/kg wet-wt)

Reported statistics:
Log BCF (regression-based estimate): 0.50 (BCF = 3.16 L/kg wet-wt)
Biotransformation Half-Life (days) : 0.00627 (normalized to 10 g fish)
Log BAF (Arnot-Gobas upper trophic): -0.05 (BAF = 0.894 L/kg wet-wt)

Log BCF (regression-based estimate): 0.50 (BCF = 3.16 L/kg wet-wt)

Biotransformation Half-Life (days) : 0.00627 (normalized to 10 g fish)

Log BAF (Arnot-Gobas upper trophic): -0.05 (BAF = 0.894 L/kg wet-wt)

Validity criteria fulfilled:
yes
Conclusions:
QSAR estimation using the BCFBAF v3.01 of the EPISUITE 4.1 indicate that the BCF of Potassium oxide is 3.162 L/kgwwt. This is well below the threshold for Bioaccumulation (B) for the PBT determination.
Executive summary:

Bioconcentration/bioaccumulation was estimated using QSAR estimation software (EPISUITE v4.1 BCFBAF v3.01), in accordance with REACH Annex XI. The estimated log BCF is 0.5 (BCF = 3.16 L/kg wet-wt) using the regression-based method.

The estimated log BAF is -0.05 (BAF = 0.894 L/kg wet-wt) using the Arnot-Gobas upper trophic method.

Description of key information

Bioconcentration/bioaccumulation was estimated using QSAR estimation software (EPISUITE v4.1 BCFBAF v3.01), in accordance with REACH Annex XI. The estimated log BCF is 0.5 (BCF = 3.16 L/kg wet-wt) using the regression-based method.
The estimated log BAF is -0.05 (BAF = 0.894 L/kg wet-wt) using the Arnot-Gobas upper trophic method.

Key value for chemical safety assessment

BCF (aquatic species):
3.16 L/kg ww

Additional information

Bioconcentration/bioaccumulation was estimated using QSAR estimation software (EPISUITE v4.1 BCFBAF v3.01), in accordance with REACH Annex XI. The estimated log BCF is 0.5 (BCF = 3.16 L/kg wet-wt) using the regression-based method.

The estimated log BAF is -0.05 (BAF = 0.894 L/kg wet-wt) using the Arnot-Gobas upper trophic method.